Funny thing is when I found the picture of the "professional" tool on Google, there were several pictures of homemade tools much like yours next to them. And it certainly would work, just as long as you have the proper ground. I still say that actually plugging into the ground on an AC outlet is the best solution, as it eliminates the possibility that anyone might be stupid enough to be touching whatever metal part of the unit you have the roach clip on. Not to mention in the case of video game machines, you have the presence of other electronic components that you don't want to take any chances on frying.